Judge dismisses other drug-related charges as part of plea deal with prosecutors.

A 52-year-old Oshkosh woman was convicted Monday on drug charges after a covert investigation led authorities to uncover a heroin-trafficking operation at her Jackson Street home.

Tena M. Riste, who appeared in custody, pleaded no contest in Winnebago County Circuit Court to maintaining a drug-trafficking place and felony bail jumping as part of a plea deal with prosecutors. Judge Karen Seifert convicted Riste and dismissed a drug paraphernalia possession charge and two counts of manufacturing or delivering marijuana, reading them into the record, and ordered a pre-sentence investigation.

According to court documents, a co-defendant in the case, Christopher D. Rose, 27, Oshkosh, twice sold 0.55 grams of heroin to a confidential information June 10 and another 0.5 grams June 17 at Riste's home in the 900 block of Jackson Street. During a search, authorities found a Triton T2 digital scale, a notebook they suspect was a drug ledger, a marijuana pipe and scale, and more than $1,600 in cash. Investigators also uncovered a series of text messages about buying heroin.

Riste could face a maximum of nine years, six months in prison. Her next court appearance is scheduled for Jan. 11.

Reach Nathaniel Shuda at 920-426-6632 or nshuda@thenorthwestern.com; on Twitter @onwnshuda.